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Western Red Cedar Cedardeck 40 x 140mm

Price From: (exc VAT) £10.27 (inc VAT) £12.32
(exc VAT) (inc VAT)
Price per linear metre £5.61 £6.73
Price per square metre £38.71 £46.45

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With its palette of warm colour tones and inclusion of well interspersed live knots, this surprisingly affordable decking material offers superior performance and outstanding aesthetic appeal.

At a glance

No other material captures the look an feel of Western Red Cedar decking

When it comes to decking there is no better material than Western Red Cedar

In addition to its stunning beauty, distinct aroma, limitless versatility and light environmental footprint, Western Red Cedar has a set of natural attributes that make it the perfect material for constructing decks and other outdoor living projects.

Dimensional stability

  • Twice the stability of most commonly available wood species
  • Compared to other wood species, Western Red Cedar does not shrink, swell or warp excessively, even when subjected to changes in temperature or moisture
  • Lies flat, stays straight and holds fasteners tightly


  • Produces long, lightweight lengths
  • Fine grain with uniform textures make it easy to cut, saw and nail with common tools
  • Free from pitch and resin so readily accepts wide range of wood finishes

Natural Decay Resistance

  • One for the world's most durable commercially available wood species
  • Lasts for decades, even in harsh environments
  • Natural resistance to moisture, decay and insect damage

Cedardeck is thick

At 40mm, this is thicker than most decking available in the UK. The extra thickness provides a number of advantages:

Fewer Joists - Joists can be spaced at 600mm centres rather than the usual 400mm, resulting in using fewer joists to construct the frame - saving both time and money

Fewer Screws - Fewer joists means far fewer screws to insert, again saving time and money, and resulting in a cleaner looking deck

Solid structure - The added thickness will make your deck feel satisfyingly solid and sturdy underfoot

Read more


Watch Silva Timber go through a pack of Western Red Cedar Decking to present the quality and consistency of our boards

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Case Study

DIY Shed Observatory using Western Red Cedar Shingles, Decking & Trim

Finishing & Protection

It is recommended that a finish is applied to all surfaces, including ends, before installation. The type of coating will be determined by the final finish and appearance desired.

Why Pre-finish?

  • Enhances the natural beauty of wood
  • Ensures a consistent finish
  • Applied in factory conditions
  • Long lasting protection against weathering
  • Simple maintenance routine
  • Reduces onsite labour costs

Sansin Enviro Stains

Easy to apply and maintain, Sansin Enviro-stains deliver outstanding performance. Sansin's range of wood protection products are available in 80 colour tones

What is weathering?

There is a risk involved when leaving wood exposed to the elements. During the weathering process wood can appear unsightly as the material can blacken due to moisture getting into the fibres and pulling out tannins and extractives. Finish protects the wood from moisture absorption and UV degradation.

Take advantage of Silva's sanding and factory pre-finishing service

Now you can buy decking pre-sanded on the surface to save the hassle of onsite preparation work

The secret to a perfect finish is to sand the surface prior to applying the coating. The more care taken with preparation, the more finish will penetrate the wood, providing an even, consistent and long-lasting finish. Studies have proven sanding can extend the life of a finish by up to 3 times compared to an unsanded surface.

Click here to find our more about the importance of sanding

For a pre-sanding quote for your project feel free to contact us


Architect Knotty Grade

Cedardeck is consistent, well manufactured Western Red Cedar decking that offers good quality and an attractive appearance at a reasonable price. It is made in Canada by a Western Red Cedar Lumber Assocation (WRCLA) member mill and exceeds the 'Architect Knotty' grading standards set by WRCLA.

The main feature of this product is the inclusion of well interspersed sound tight (live) knots. Occasional small 'not firmly fixed knots' are also permitted, however they are very few in number and will not detract from the overall appearance. A small percentage of boards will exhibit some wane on the reverse, however this will not be visible once the boards are installed.

For a more detailed explanation of the grade, along with an examination of a full pack accompanied by a video showing every board, please click here


Western Red Cedar is the ultimate green building material. It is legally, responsibly and sustainably harvested in the publicly managed forests of British Columbia, Canada. Less than 1% of standing timber is harvested each year.

For each tree harvested, three are replanted to ensure the forests will exist in perpetuity. Western Red Cedar has a low impact on the environment throughout its life cycle. It requires significantly less energy to produce than man-made alternatives and is bio-degradable.

  • FSC
  • PEFC
  • Trada member
  • Responsible purchaser
  • Cedar Shake & Shingle Bureau
  • Secured by